Hoisting apparatus



Jan. 8, L L. EAKIN HOISTING APPARATUS 3 Sheets-Sheet l Filed Jan. 3l, 1949 Zoug/E gmk 3 Sheets-Sheet 2 INVENTOR.

ATTORNEY Jan. 8, 1952 L. L. EAKIN HOISTING APPARATUS Filed Jan. 3l, 1949 Jan. 8, 1952 L.. l.. EAKIN 2,582,111

HOISTINGa APPARATUS Filed Jan. 5l, 1949 3 Sheets-Sheet 5 INV ENT OR.

ATTORNEY.

Patented Jan. 8, 1952 UNITED STATES lPATENT GFFICE HOISTING APPARATUS Lourie L. Eakin, Ventura, Calif. Application January 31, 1949, Serial No. 73,694 1o claims. (ci. 21a- 8) 2 Fig. 4 is a transverse sectional elevational view thereof, taken through-L4 of Fig. 2;

Fig. 5 is a transverse sectional view, taken through 5--5 of Fig. 2, showing particularly the means for automatically shifting the direction of control for the boom;

boom-raising or holding force is applied, when the boom is in a low, reclining, or substantially horizontal position, than when in a substantially upright or intermediate position.

An important object of this invention is to provide a novel mechanism whereby uniform screw-operating means is employed for impartn ing variable load-raising force, or variable length-lever action to a raising force, and one which is particularly adapted for variously swinging a boom.

An important object also of this invention is to provide a hoisting apparatus of this class which is designed so that it may be readily carried by and effectively used on vehicles, and particularly automobiles or trucks.

Another important object of this invention is to provide simple, positive, and foolproof means for shifting or tilting the boom in opposite direc tions, and particularly for-limiting the shifting or tilting of the boom in either direction, an important feature of this invention being the provision of such control in immediate connection with the swinging boom.

With these and other objects in view, as will appear hereinafter, I have devised a hoisting apparatus having certain novel features of construction, combination, and arrangement of parts and portions, as will be hereinafter described in detail, and particularly set forth in the appended claims, reference being had to the accompanying drawings and to the characters of ref erence thereon, which form a part of this application, in which:

Fig. 1 is a side elevational view of an automobile truck embodying my invention of the mechanically-operated boom mechanism in one form, and also showing embodied therein a tiltable load-carrying body, and showing by dotted lines said body and boom in a partly raised position;

Fig. 2 is an enlarged fragmentary sectional elevational view showing the boom-operating mechanism illustrated generally in Fig. 1;

Fig. 3 is a fragmentary plan view of the mechanism, shown in Fig. 2;

Fig. 6 is a plan view of the load-carrying body and the boom, shown in Fig. 1;

Fig. 7 is an enlarged top view of the means for attaching the boom to the load-carrying body for raising the latter, a portion of the attachment being shown, in a shifted position, by dotted lines; and

Fig. 8 is a fragmentary elevational view thereof, taken through 8-8 of Fig. '7.

In the drawings'l have shown my invention embodied in a conventional motor vehicle or truck I, having a drivers cab 2 at the forward end, and at the rear end at' platform 3, for supporting various objects during transportation, the platform being carried on the chassis 4 of the vehicle.

Rotatably or pivotally mounted on the side rails 4a of the chassis 4, and transversely with respect to the longitudinal axis of the vehicle, is a rock shaft Il made up of axially aligned shaft sections IIa and IllD spaced apart at their inner ends. These inner ends are rotatably mounted in plates I2a and Ilb forming the opposite sides of a rectangular frame I2 carried at the rear p0rticn of the chassis 4 between the side rails 4a thereof.

To the inner end of the shaft sections IIa and IIb are secured the inner ends of arms I3 which are longitudinally slotted, as indicated by I 3a, that is, radially vslotted with respect to the axis of the shaft Il. The free ends of the arms are connected by means of a nut or block I4 which has trunnions I4a at its opposite ends, which trunnions extend slidably through the slots. The trunnions also extend into and are slidable in plate-cam slots I2c in the plates I2a and |212. These cam slots aresubstantially arcuate and are arranged below the axis of the shaft, the ends of the slots extending forwardly and backwardly withr respect thereto,A aswill be hereinafter described in greater detail.

The boom, designated I5, comprises arms Iiia and I5. One end of the respective arms is positioned at the outer sides of the rails ia of the chassis 4 and mounted on the outer ends of the shaft sections IIEL and II b. The free portions of the ends of the arms of the boom converge and are secured at their outer ends, as shown best in Fig. 6, a sheave I6 being mounted at the converging ends of the arms of the boom. The arms are also transversely offset intermediate their ends providing portions Ic and I5d which are positioned horizontally, when the boom is directed forwardly with respect to the vehicle, the portions I5c being substantially flush with the deck or platform 3 and the portions I5d extending over the cab 2 of the vehicle, as shown best in Fig. 1.

The boom I5 is swung about its horizontal axis, to forwardly or rearwardly directed positions, by a suitable motor 2I carried by the chassis of the vehicle, preferably forwardly of the platform 3. This motor operates or rotates a long screw 22 which moves the nut or block I4 forwardly or backwardly within the cam slots I2C, the mechanism connecting the motor to the screw being hereinafter described in detail.

The drive shaft 23 may be the motor shaft or it may be connected thereto through intermediate gearing, not shown. The rear end of the drive s shaft is rotatably mounted in a bearing frame 24 mounted at the free end of an arm 29 in such a manner that the driven gear 28 may be shifted laterally to mesh with either of the gears 26 or '21, depending upon the desired directionof rotation of the gear 28. The arm 29 is pivotally mounted intermediate its ends on the bearing frame 24, as indicated by 30.

The gear 28 has a forwardly extending stud shaft 3| which is connected through a universal joint 32, shaft 33, and a sliding and swivel connection 34, to a forwardly extending stud shaft 35 carried by a pinion 36. At the forward portion of the frame I2 is pivotally mounted a bearing member 31 which is shown as having trunnions 31a which are pivotally mounted in the two side plates I2a and I2b of the frame I2. The forward end of the screw 22 is rotatably mounted in the bearing member, the axis of the screwrextending preferably through the axis of the pivotalv At the forward end of the screw is secured a gear 38 whichk mounting of the bearing member.

meshes with and is driven by the pinion 38. This pinion has a stub shaft 39 opposed to but axially aligned with the stub shaft 35, and the stub shaft 39 rotatably supports the pinion 36 on the bearing member,l as shown best in Fig. 2. Thus,

operation, of the motor turns the screw 22 which' moves the nut or block I4 in the cam slots I2C for tilting the boom.

Within the frame I2, and preferably at the which are adapted to be engaged by the blocky I4 near its forward and rear positions for .shifting the yoke. wardly extending rod 42, the forward end of which is reciprocally mounted in the lower por-n tion of the bearing frame 24. The forward portion of the rod carries a cam 43 having a diagonalV the cam 43 is drawn backwardly causing the lower end of the gear-shifting arm 29 to be shifted to.'

The yoke is provided with a for-y the right, by means of the cam 43e, thereby shifting the driven gear 28 to mesh with the gear 25, thus causing the screw 22 to be rotated in the opposite direction. This result is produced when the boom is shifted either to its forwardly or rearwardly directed positions and thereby preventing any sudden or positive limits for the mechanism controlling the boom.

It will be here noted that although the cam slot I2c is substantially arcuate and eccentric it is a relatively wide sweeping cam slot, the forward portion thereof being of less curvature than the rear portion. It will also be noted that the longitudinal axis of the arms I3, instead of being in' substantial and opposed alignment with the arms I5a and I5b of the boom, may be at a slight obtuse angle with "respect thereto, as shown in Fig. 2, so as to facilitate raising of the boom from the forward position in which the portions I5c are substantially flush with the platform of the vehicle.

It will `be here also noted that the frame I2 may be substantially enclosed and serve as an oil or grease box for the mechanism supported by the frame I2.

On the rear portion of the platform 3 of the vehicle is carried a tiltable body 5I, which is herein shown as box-like. It is pivotally mounted at its rear end and lower portion, as indicated by 52, on the rear end of the platform of the vehicle, the pivotal axis for the tilting of the boxlike body being positioned backwardly from the pivotal axis of the boom.

On the opposite side walls 5Ia of the body are provided attachments, shown best in Figs. 7 and 8, for raising or tilting the forward end of the body when the ,boom is raised. Each of the attachments consists of brackets 53, which may be of U-shaped form, upon which are pivotally supported arms 54. On the outer ends of the arms are mounted rollers 55. When the arms are shifted so that they extend directly outwardly from the sides of the body 5I, they are in a position to be engaged by the arms of the boom as it is raised from its forward to an upward position, as shown best by dotted lines in Fig. 1. This causes tilting of the body 5I in order to facilitate the discharge of the contents therein. The ends of the arms 54, opposite the rollers 55, are so constructed that they engage the inner portions of the brackets so as to prevent further backward shifting of the rollers, the inner ends of the arms 54 being shaped substantially as indicated by 54a in Fig. 7. When it is desired not to raise or tilt the body, the roller-carrying arms 54 are shifted forwardly, as indicated by dotted lines in Fig. 7.

I wish it to be understood that I do not desire to be limited to the exact details of construction shown and described, for obvious modications will occur to a person skilled in the art.

I claim:

l. In a hoisting apparatus, a support, a boom pivoted on the support and on an axis transversely thereto and adapted to move to various operative positions with respect thereto, said boom having an arm extending from said pivotal axis, a frame on the support located in a piane 1 perpendicular to said axis and having a plate on the cam and also on the arm, a bearing member pivotally mounted on a horizontal axis on and transversely to the fra-me, a screw rotatably mounted at one end on the bearing member and fixed against longitudinal movement thereon and screwably extending with its other end into the block formoving the same on said cam and on seidarm, and means for rotating the screw.

y 2. In a hoisting apparatus, a support, a boom pivoted on the support and on an axis transversely thereto and adapted to move to various operative positions with respect thereto, said boom having an arm extending from said pivotal axis, a-frame on the support locatedin a plane perpendicular to said axis and-'having a substantially arcuate cam extending eccentrically around the lower portion of the axis, the ends being located at a greater distance laterally from the axis than the middle portion below the axis, a block slidably mounted on the cam and also on the arm, a bearing member pivotally mounted on a horizontal axis on and transversely to the frame, a screw rotatably7 mounted at one end on the bearing member and fixed against longitu* dinal movement thereon and screwably extending with its other end into the block for movu ing the same on said cam and on said arm, and means for rotating the screw.

3. In a hoisting apparatus, a support, a boom pivoted on the support and on an axis transversely thereto and adapted to move to various operative positions with respect thereto, said boom having an arm extending in a direction from its pivotal axis opposite the main portion of the boom, a frame on the support located in a plane perpendicular to said axis and having a plate cam located around the lower portion of the axis with its ends located a greater distance laterally forwardly and backwardly from the axis than the middle portion vertically below the axis, a block slidably mounted on the cam and also on the arm, a bearing member pivotally mounted on a horizontal axis on and transversely to the frame, a screw rotatably mounted at one end on the bearing member and xed against longitudinal movement thereon and screwably extending with its other end into the block for moving the same on said cam and on said arm, and means for rotating the screw.

4. In a hoisting apparatus, a support, a boom pivoted on the support and on an axis transversely thereto and adapted to move' to various operative positions with respect thereto, said boom having`an arm extending in a direction from its pivotal axis opposite the main portion of the boom, said arm being radially slotted, a frame on the support located in a plane perpendicular to said axis and having a plate cam located around the lower portion of the axis with its ends located a greater distance laterally forwardly land backwardly from the axis than the middle portion vertically below the axis, a block slidably mounted on the cam and also slidably mounted in the slot of the arm, a bearing member pivotally mounted on a horizontal axis on and transversely to the frame, a screw rotatably mounted at one end on the bearing member and fixed against longitudinal movement thereon and screwably extending with its other end into the block for moving the same on said cam and on said means, and means for rotating thescrew.

5. In a hoisting apparatus, a support, a boom pivoted on the support and on an axis transversely thereto and adapted to move to various operative positions with respect thereto, said boom having an arm extending in a direction from its pivotal axis opposite the main portion of the boom', a frame on the support located in a plane perpendicular to said axis andrhaving a positive motion slotted plate cam located around the lower portion of the axis with its ends located va greater distance laterally forwardly and backwardly from theaxisthanthe middle portion vertically below theaxis, ablock slidably mounted in the cam slot andlalso ori-the arm, a bearing member pivotally mounted on a horizontal axis on and transversely to the frame, ascrew rotatably mounted at one -on thel bearing member and xed against lengitudinal movement thereon and screwably expending: with its other end into the block for moving the same on said cam and on said arm, and means for rotating the screw.

, 6.. Ina 4hoisting apparatus, a support, a boom pivoted on the support and o n an axis transversely thereto and adapted to move to various operative positions with respect thereto, said boom having anarm extendingfrom said pivotal axis, a frame the support located infa plane perpendicular tri-said and having a cam located around the axis with an end of the cam located a greater distance laterally from the axis than the adjacent portionoi'the cam, a block slidably mounted on the arm, a bearing member pivotally mounted on a horizontal axis on and transversely to the frame, a screw rotatably mounted at one end on the bearing member and fixed against longitudinal movement thereon and screwably extending with its other end into the block for moving the same on said cam, means for rotating the screw comprising power means, and reduction gear means connecting the power means to the first end of the screw.

7. In a hoisting apparatus, a support, a boom pivoted cn the support and on an axis transversely thereto and adapted to move to various operative positions with respect thereto, said boom having an arm extending from said pivotal axis, a frame on the support located in a plane perpendicular to said axis and having a cam located around the axis with an end of the cam located a greater distance laterally from the axis than the adjacent portion of the cam, a block slidably mounted on the arm, a bearing member pivotaliy mounted on a horizontal axis on and transversely to the frame, a screw rotatably mounted at one end on the bearing member and fixed against longitudinal movement thereon and screwably extending with its other end into the block for moving the same on said cam, means for rotating the screw comprising a spur gear connected to the iirst end of the screw, a pinion mounted on the bearing member and meshing with the first gear, a power means, and a longitudinally extensible connection between the power means and the pinion.

3. In a hoisting apparatus, a support, a boom pivote-:i on the `support and on an axis transversely thereto and adapted to move to various operative positions with respect thereto, said boom having an arm extending from said pivotal axis, a frame on the support located in a plane perpendicular to said axis and having a cam located around the axis with an end of the cam located a greater distance laterally from the axis than the adjacent portion of the cam, a block slidably mounted on the arm, a bearing member pivotally mounted on a horizontal axis on and transversely to the frame, a screw rotatably mounted at one end on the bearing member and fixed against longitudinal movement thereon and screwably extending with its other end into the block for moving the same on said cam, and means for rotating the screw.

9. In a hoisting apparatus, a support, a boom pivoted on the support and adapted to move to various operative positions with respect theretm said boom having an arm extending from said pivotal axis, a motor, gear means for the motor, a driven gear variously connectable to the gear means, a shiftable gear support for the gear, a screw connecting said gear to said arm, a` shifting member straddling the axis of the boom and having spaced abutments adapted to be engaged by said arm when in extreme opposite positions, and means connecting the shifting member to said gear support for shifting the same with. the movement of said shifting member.

l0. In a hoisting apparatus, a support, a boom pivoted on the support and adapted to move to various operative positions with respect thereto, said boom having an arm extending from said pivotal axis, a frame on the support located in a plane perpendicular to said axis and having a plate cam located around the axis with its ends located a greater distance laterally forwardly and backwardly from the axis than the middle portion vertically from the axis, a block slidably mounted on the cam and also on the arm, a screw rotatably 8 supported at one end by the frame and screwably extending with its other end into the block for moving the same on said cam and on said arm, a motor, gear means for the motor, a driven gear adapted to be variously connected with the gear means, a shiftable support for the driven gear, a yoke shiftably mounted on said frame and having arms positioned at opposite sides of the block and adapted to be engaged thereby, when the boom is shifted to near its opposite positions for shifting the yoke, and means connecting the yoke with said gear support for shifting the gear with the movements of the yoke.

LOURIE L. EAKIN.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,038,809 Williams Sept. 17, 1912 1,388,831 Broady Aug. 23, 1921 2,181,253 Willis Nov. 28, 1939 

